content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.flowable.internal.operators;
  
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  
  import org.junit.*;
  import org.mockito.Mockito;
  import org.reactivestreams.*;
  
  import hu.akarnokd.reactivestreams.extensions.*;
  import io.reactivex.common.*;
  import io.reactivex.common.exceptions.TestException;
  import io.reactivex.common.functions.*;
  import io.reactivex.common.internal.functions.Functions;
  import io.reactivex.flowable.*;
  import io.reactivex.flowable.internal.subscriptions.BooleanSubscription;
  import io.reactivex.flowable.processors.*;
  import io.reactivex.flowable.subscribers.*;
  
  public class FlowableFilterTest {
  
      @Test
      public void testFilter() {
          Flowable<String> w = Flowable.just("one", "two", "three");
          Flowable<String> Flowable = w.filter(new Predicate<String>() {
  
              @Override
              public boolean test(String t1) {
                  return t1.equals("two");
              }
          });
  
          Subscriber<String> Subscriber = TestHelper.mockSubscriber();
  
          Flowable.subscribe(Subscriber);
  
          verify(Subscriber, Mockito.never()).onNext("one");
          verify(Subscriber, times(1)).onNext("two");
          verify(Subscriber, Mockito.never()).onNext("three");
          verify(Subscriber, Mockito.never()).onError(any(Throwable.class));
          verify(Subscriber, times(1)).onComplete();
      }
  
      /**
       * Make sure we are adjusting subscriber.request() for filtered items
       * @throws InterruptedException if the test is interrupted
       * @throws InterruptedException if the test is interrupted
       */
      @Test(timeout = 500)
      public void testWithBackpressure() throws InterruptedException {
          Flowable<String> w = Flowable.just("one", "two", "three");
          Flowable<String> o = w.filter(new Predicate<String>() {
  
              @Override
              public boolean test(String t1) {
                  return t1.equals("three");
              }
          });
  
          final CountDownLatch latch = new CountDownLatch(1);
          TestSubscriber<String> ts = new TestSubscriber<String>() {
  
              @Override
              public void onComplete() {
                  System.out.println("onComplete");
                  latch.countDown();
              }
  
              @Override
              public void onError(Throwable e) {
                  e.printStackTrace();
                  latch.countDown();
              }
  
              @Override
              public void onNext(String t) {
                  System.out.println("Received: " + t);
                  // request more each time we receive
                  request(1);
              }
  
          };
          // this means it will only request "one" and "two", expecting to receive them before requesting more
          ts.request(2);
  
          o.subscribe(ts);
  
          // this will wait forever unless OperatorTake handles the request(n) on filtered items
          latch.await();
      }
  
      /**
       * Make sure we are adjusting subscriber.request() for filtered items
       * @throws InterruptedException if the test is interrupted
       */
      @Test(timeout = 500000)
      public void testWithBackpressure2() throws InterruptedException {
          Flowable<Integer> w = Flowable.range(1, Flowable.bufferSize() * 2);
          Flowable<Integer> o = w.filter(new Predicate<Integer>() {
  
              @Override
              public boolean test(Integer t1) {
                  return t1 > 100;
              }
          });
  
          final CountDownLatch latch = new CountDownLatch(1);
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
  
              @Override
              public void onComplete() {
                  System.out.println("onComplete");
                  latch.countDown();
              }
  
              @Override
              public void onError(Throwable e) {
                  e.printStackTrace();
                  latch.countDown();
              }
  
              @Override
              public void onNext(Integer t) {
                  System.out.println("Received: " + t);
                  // request more each time we receive
                  request(1);
              }
          };
          // this means it will only request 1 item and expect to receive more
          ts.request(1);
  
          o.subscribe(ts);
  
          // this will wait forever unless OperatorTake handles the request(n) on filtered items
          latch.await();
      }
  
      @Test
      @Ignore("subscribers are not allowed to throw")
      public void testFatalError() {
  //        try {
  //            Flowable.just(1)
  //            .filter(new Predicate<Integer>() {
  //                @Override
  //                public boolean test(Integer t) {
  //                    return true;
  //                }
  //            })
  //            .first()
  //            .subscribe(new Consumer<Integer>() {
  //                @Override
  //                public void accept(Integer t) {
  //                    throw new TestException();
  //                }
  //            });
  //            Assert.fail("No exception was thrown");
  //        } catch (OnErrorNotImplementedException ex) {
  //            if (!(ex.getCause() instanceof TestException)) {
  //                Assert.fail("Failed to report the original exception, instead: " + ex.getCause());
  //            }
  //        }
      }
  
      @Test
      public void functionCrashUnsubscribes() {
  
          PublishProcessor<Integer> ps = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
  
          ps.filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  throw new TestException();
              }
          }).subscribe(ts);
  
          Assert.assertTrue("Not subscribed?", ps.hasSubscribers());
  
          ps.onNext(1);
  
          Assert.assertFalse("Subscribed?", ps.hasSubscribers());
  
          ts.assertError(TestException.class);
      }
  
      @Test
      public void doesntRequestOnItsOwn() {
          TestSubscriber<Integer> ts = TestSubscriber.create(0L);
  
          Flowable.range(1, 10).filter(Functions.alwaysTrue()).subscribe(ts);
  
          ts.assertNoValues();
  
          ts.request(10);
  
          ts.assertValues(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
          ts.assertNoErrors();
          ts.assertComplete();
      }
  
      @Test
      public void conditional() {
          Flowable.range(1, 5)
          .filter(Functions.alwaysTrue())
          .filter(Functions.alwaysTrue())
          .test()
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void conditionalNone() {
          Flowable.range(1, 5)
          .filter(Functions.alwaysTrue())
          .filter(Functions.alwaysFalse())
          .test()
          .assertResult();
      }
  
      @Test
      public void conditionalNone2() {
          Flowable.range(1, 5)
          .filter(Functions.alwaysFalse())
          .filter(Functions.alwaysFalse())
          .test()
          .assertResult();
      }
  
      @Test
      public void conditionalFusedSync() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5)
          .filter(Functions.alwaysTrue())
          .filter(Functions.alwaysTrue())
          .subscribe(ts);
  
          ts.assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.SYNC))
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void conditionalFusedSync2() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5)
          .filter(Functions.alwaysFalse())
          .filter(Functions.alwaysFalse())
          .subscribe(ts);
  
          ts.assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.SYNC))
          .assertResult();
      }
  
      @Test
      public void conditionalFusedAsync() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          UnicastProcessor<Integer> up = UnicastProcessor.create();
  
          up
          .filter(Functions.alwaysTrue())
          .filter(Functions.alwaysTrue())
          .subscribe(ts);
  
          up.onNext(1);
          up.onNext(2);
          up.onNext(3);
          up.onNext(4);
          up.onNext(5);
          up.onComplete();
  
          ts.assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.ASYNC))
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void conditionalFusedNoneAsync() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          UnicastProcessor<Integer> up = UnicastProcessor.create();
  
          up
          .filter(Functions.alwaysTrue())
          .filter(Functions.alwaysFalse())
          .subscribe(ts);
  
          up.onNext(1);
          up.onNext(2);
          up.onNext(3);
          up.onNext(4);
          up.onNext(5);
          up.onComplete();
  
          ts.assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.ASYNC))
          .assertResult();
      }
  
      @Test
      public void conditionalFusedNoneAsync2() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          UnicastProcessor<Integer> up = UnicastProcessor.create();
  
          up
          .filter(Functions.alwaysFalse())
          .filter(Functions.alwaysFalse())
          .subscribe(ts);
  
          up.onNext(1);
          up.onNext(2);
          up.onNext(3);
          up.onNext(4);
          up.onNext(5);
          up.onComplete();
  
          ts.assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.ASYNC))
          .assertResult();
      }
  
      @Test
      public void sourceIgnoresCancelConditional() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
  
          try {
              Flowable.fromPublisher(new Publisher<Integer>() {
                  @Override
                  public void subscribe(Subscriber<? super Integer> s) {
                      ConditionalSubscriber<? super Integer> cs = (ConditionalSubscriber<? super Integer>)s;
                      cs.onSubscribe(new BooleanSubscription());
                      cs.tryOnNext(1);
                      cs.tryOnNext(2);
                      cs.onError(new IOException());
                      cs.onComplete();
                  }
              })
              .filter(new Predicate<Integer>() {
                  @Override
                  public boolean test(Integer v) throws Exception {
                      return true;
                  }
              })
              .filter(new Predicate<Integer>() {
                  @Override
                  public boolean test(Integer v) throws Exception {
                      throw new TestException();
                  }
              })
              .test()
              .assertFailure(TestException.class);
  
              TestCommonHelper.assertUndeliverable(errors, 0, IOException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void mapCrashesBeforeFilter() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
  
          try {
              Flowable.fromPublisher(new Publisher<Integer>() {
                  @Override
                  public void subscribe(Subscriber<? super Integer> s) {
                      s.onSubscribe(new BooleanSubscription());
                      s.onNext(1);
                      s.onNext(2);
                      s.onError(new IOException());
                      s.onComplete();
                  }
              })
              .map(new Function<Integer, Integer>() {
                  @Override
                  public Integer apply(Integer v) throws Exception {
                      throw new TestException();
                  }
              })
              .filter(new Predicate<Integer>() {
                  @Override
                  public boolean test(Integer v) throws Exception {
                      return true;
                  }
              })
              .test()
              .assertFailure(TestException.class);
  
              TestCommonHelper.assertUndeliverable(errors, 0, IOException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void syncFused() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5)
          .filter(Functions.alwaysTrue())
          .subscribe(ts);
  
          ts.assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.SYNC))
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void syncNoneFused() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5)
          .filter(Functions.alwaysFalse())
          .subscribe(ts);
  
          ts.assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.SYNC))
          .assertResult();
      }
  
      @Test
      public void syncNoneFused2() {
          TestSubscriber<Integer> ts = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5)
          .filter(Functions.alwaysFalse())
          .filter(Functions.alwaysFalse())
          .subscribe(ts);
  
          ts.assertOf(SubscriberFusion.<Integer>assertFuseable())
          .assertOf(SubscriberFusion.<Integer>assertFusionMode(FusedQueueSubscription.SYNC))
          .assertResult();
      }
  
      @Test
      public void sourceIgnoresCancel() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
  
          try {
              Flowable.fromPublisher(new Publisher<Integer>() {
                  @Override
                  public void subscribe(Subscriber<? super Integer> s) {
                      s.onSubscribe(new BooleanSubscription());
                      s.onNext(1);
                      s.onNext(2);
                      s.onError(new IOException());
                      s.onComplete();
                  }
              })
              .filter(new Predicate<Integer>() {
                  @Override
                  public boolean test(Integer v) throws Exception {
                      throw new TestException();
                  }
              })
              .test()
              .assertFailure(TestException.class);
  
              TestCommonHelper.assertUndeliverable(errors, 0, IOException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void sourceIgnoresCancel2() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
  
          try {
              Flowable.fromPublisher(new Publisher<Integer>() {
                  @Override
                  public void subscribe(Subscriber<? super Integer> s) {
                      s.onSubscribe(new BooleanSubscription());
                      s.onNext(1);
                      s.onNext(2);
                      s.onError(new IOException());
                      s.onComplete();
                  }
              })
              .filter(new Predicate<Integer>() {
                  @Override
                  public boolean test(Integer v) throws Exception {
                      throw new TestException();
                  }
              })
              .filter(Functions.alwaysTrue())
              .test()
              .assertFailure(TestException.class);
  
              TestCommonHelper.assertUndeliverable(errors, 0, IOException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void sourceIgnoresCancelConditional2() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
  
          try {
              Flowable.fromPublisher(new Publisher<Integer>() {
                  @Override
                  public void subscribe(Subscriber<? super Integer> s) {
                      ConditionalSubscriber<? super Integer> cs = (ConditionalSubscriber<? super Integer>)s;
                      cs.onSubscribe(new BooleanSubscription());
                      cs.tryOnNext(1);
                      cs.tryOnNext(2);
                      cs.onError(new IOException());
                      cs.onComplete();
                  }
              })
              .filter(new Predicate<Integer>() {
                  @Override
                  public boolean test(Integer v) throws Exception {
                      throw new TestException();
                  }
              })
              .filter(Functions.alwaysTrue())
              .test()
              .assertFailure(TestException.class);
  
              TestCommonHelper.assertUndeliverable(errors, 0, IOException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Flowable.range(1, 5).filter(Functions.alwaysTrue()));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Flowable<Object>>() {
              @Override
              public Flowable<Object> apply(Flowable<Object> o) throws Exception {
                  return o.filter(Functions.alwaysTrue());
              }
          });
      }
  
      @Test
      public void fusedSync() {
          TestSubscriber<Integer> to = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          Flowable.range(1, 5)
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .subscribe(to);
  
          SubscriberFusion.assertFusion(to, FusedQueueSubscription.SYNC)
          .assertResult(2, 4);
      }
  
      @Test
      public void fusedAsync() {
          TestSubscriber<Integer> to = SubscriberFusion.newTest(FusedQueueSubscription.ANY);
  
          UnicastProcessor<Integer> us = UnicastProcessor.create();
  
          us
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .subscribe(to);
  
          TestHelper.emit(us, 1, 2, 3, 4, 5);
  
          SubscriberFusion.assertFusion(to, FusedQueueSubscription.ASYNC)
          .assertResult(2, 4);
      }
  
      @Test
      public void fusedReject() {
          TestSubscriber<Integer> to = SubscriberFusion.newTest(FusedQueueSubscription.ANY | FusedQueueSubscription.BOUNDARY);
  
          Flowable.range(1, 5)
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .subscribe(to);
  
          SubscriberFusion.assertFusion(to, FusedQueueSubscription.NONE)
          .assertResult(2, 4);
      }
  
      @Test
      public void filterThrows() {
          Flowable.range(1, 5)
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  }
  